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package com.oracle.svm.core.jfr.throttling;

import static com.oracle.svm.core.Uninterruptible.CALLED_FROM_UNINTERRUPTIBLE_CODE;

import org.graalvm.nativeimage.Platform;
import org.graalvm.nativeimage.Platforms;

import com.oracle.svm.core.Uninterruptible;
import com.oracle.svm.core.jfr.JfrEvent;
import com.oracle.svm.core.jfr.JfrTicks;

public class JfrEventThrottling {
    private final JfrEventThrottler objectAllocationSampleEventThrottler;

    @Platforms(Platform.HOSTED_ONLY.class)
    public JfrEventThrottling() {
        objectAllocationSampleEventThrottler = new JfrEventThrottler();
    }

    public boolean setThrottle(long eventTypeId, long eventSampleSize, long periodMs) {
        if (eventTypeId == JfrEvent.ObjectAllocationSample.getId()) {
            objectAllocationSampleEventThrottler.configure(eventSampleSize, periodMs);
        }
        return true;
    }

    @Uninterruptible(reason = CALLED_FROM_UNINTERRUPTIBLE_CODE, mayBeInlined = true)
    public boolean shouldCommit(JfrEvent event) {
        if (event == JfrEvent.ObjectAllocationSample) {
            return objectAllocationSampleEventThrottler.isDisabled() || objectAllocationSampleEventThrottler.sample(JfrTicks.now());
        }

        assert !event.supportsThrottling();
        return true;
    }
}
